54 results about "Ruthenium dioxide" patented technology

The invention relates to the technical field of thick-film resistors, and discloses a high-sheet-resistance resistor paste, a preparation method thereof and a thick-film circuit. The resistance paste comprises 6%-24% of a composite conductive phase, 33%-57% of an inorganic binding phase, 2%-6% of a modifier and 22%-38% of an organic carrier. The conductive phase comprises nano-scale / submicron-scale ruthenium dioxide powder and submicron-scale flake silver powder, and the conductivity and the stability are cooperatively guaranteed. According to the preparation method, a secondary dispersing and grinding process is adopted, and a finished product is obtained through coarse grinding, vacuumizing fine grinding and 800-mesh filtering. The thick film circuit adopts an N-group parallel architecture, so that the use amount of conductive phases can be greatly reduced. The problem that traditional slurry is poor in stability under high sheet resistance is solved, TCR is smaller than or equal to 100 ppm / DEG C, resistance precision is within + / -5%, temperature and humidity stability is excellent, cost is low, and the slurry is suitable for high-precision heating scenes such as a new energy automobile heating system.

The invention discloses a cobalt-doped ruthenium dioxide nanoparticle material as well as a preparation method and application thereof, and relates to a ruthenium dioxide nanoparticle material as well as a preparation method and application thereof. The nano-particle cluster is formed by irregularly distributing nano-particles; the nanoparticles have a single-phase crystal structure, and the spacing distribution of {110} crystal faces is 0.315 nm; the material is composed of three elements of Co, Ru and O, wherein Co is doped into RuO2 to form Co < 0.3 > Ru0. 7O2 nanoparticles; the material is of an octahedral structure, and Ru sites are replaced by Co doping; the chemical valence state of Ru on the surface of the material is a mixed valence state of + 3 and + 4; charge transfer occurs among three ions of Co, Ru and O, so that Ru is in a lower oxidation state. The cobalt-doped ruthenium dioxide nanoparticle material is used for electrolyzing water to produce hydrogen, and shows 2500-hour long-term stability under the current density of 10 mAcm <-2 >.

The application belongs to the technical field of electrochemical materials and application, and provides a multi-metal layered titanium anode material, which is mainly applied to the processes of water electrolysis hydrogen production, wastewater treatment and electrochemical energy storage, and belongs to the direction of new energy and environmental governance.The multi-metal layered titanium anode material comprises, from bottom to top, a titanium substrate, a bonding layer, a catalytic layer and a protective layer; the material of the catalytic layer is a composite of ruthenium dioxide and iridium dioxide, wherein the molar ratio of ruthenium dioxide to iridium dioxide is 1:2-3, and the thickness of the catalytic layer is 3-4 mu m.The multi-metal layered titanium anode material prepared by the application exhibits high stability and high efficiency in the fields of water electrolysis hydrogen production, wastewater treatment and electrochemical energy storage, can prolong the service life and improve the energy utilization rate, meets the needs of energy saving and emission reduction, green low carbon, resource recycling and strategic emerging industry development, and has significant economic benefits and social value.

The invention discloses a bifunctional hollow nitrogen-doped carbon nanobox loaded ruthenium-ruthenium dioxide nano-catalyst as well as a preparation method and application thereof, and relates to the technical field of electro-catalysis. According to the preparation method, ZIF-8, ruthenium acetylacetonate and NaBr are adopted as raw materials and calcined in an inert atmosphere to obtain a hollow nitrogen-doped carbon nanobox loaded ruthenium nano-catalyst, and the hollow nitrogen-doped carbon nanobox loaded ruthenium-ruthenium dioxide nano-catalyst is obtained by calcining the hollow nitrogen-doped carbon nanobox loaded ruthenium nano-catalyst in an air atmosphere. Wherein through air calcination treatment, a derived carbon layer on the surface of the hollow nitrogen-doped carbon nanobox loaded ruthenium nano-catalyst can be burnt out, so that active substances are exposed, and the catalytic activity is improved; and elemental Ru can be partially oxidized into RuO2 to form Ru-RuO2 heterojunction, so that the stability and the HER performance are improved. The difunctional hollow nitrogen-doped carbon nanobox loaded ruthenium-ruthenium dioxide nano-catalyst prepared by the invention has excellent HER and OER activity, and can be used for electro-catalytic complete water splitting.

Methods of fabricating and packaging ohmic microelectromechanical system (MEMS) switch devices can include constructing a switch device on an insulating substrate. The switch device can have contacts composed of a platinum group metal. The methods can also include forming an oxide layer of the platinum group metal on an outer surface of each of the one or more contacts. The methods can also include bonding an insulating cap to the insulating substrate to hermetically seal the switch device. The bonding can occur in an atmosphere having an oxygen proportion in a range of 0.5% to 30%, such that after the switch device has been hermetically sealed within a sealed cavity, the atmosphere within the sealed cavity has an oxygen proportion in a range of 0.5% to 30%. The platinum group metal can be ruthenium, and the oxide layer of the platinum group metal can be ruthenium dioxide.

The invention discloses a preparation method of an anode structure of a proton exchange membrane water electrolysis cell, and the anode structure of the proton exchange membrane water electrolysis cell comprises a germanium-doped ruthenium dioxide flaky aggregate anode catalyst, the preparation method of the germanium-doped ruthenium dioxide flaky aggregate anode catalyst comprises the following steps: dissolving solid inorganic ruthenium salt, an organic germanium complex and polyvinylpyrrolidone in a solvent, and stirring at room temperature to obtain a stock solution; carrying out electrostatic spinning on the obtained stock solution, and drying to obtain a nanofiber precursor; and carrying out heat treatment on the precursor to obtain the germanium-doped ruthenium dioxide flaky aggregate anode catalyst. The invention further discloses the prepared catalyst and application of the catalyst in an acid solution, a water electrolysis oxygen evolution reaction and a proton exchange membrane PEM water electrolysis hydrogen production reaction. The catalyst shows excellent electrocatalytic activity when applied to PEM water electrolysis hydrogen production reaction and water electrolysis oxidation reaction, and still has good stability after long-term work.

The invention discloses a cobalt and tungsten co-doped ruthenium dioxide electrocatalyst as well as a preparation method and application thereof, and belongs to the technical field of hydrogen production by electrocatalytic water decomposition. The electrocatalyst provided by the invention comprises RuO2 nanoparticles, tungsten atoms and cobalt atoms, wherein the tungsten atoms and the cobalt atoms are doped in the RuO2 nanoparticles. Tungsten atoms and cobalt atoms are doped in crystal lattices of RuO2 nano-particles to form a complex (CoW-RuO2), the electron transmission capacity of the catalyst is regulated and controlled through introduction of heteroatoms, then the center of an O < 2 > p band moves downwards, the formation energy of oxygen vacancies in CoW-RuO2 is remarkably increased, and soluble high-valence Ruxgt is prevented; and 4, generating. In addition, the preparation method provided by the invention has the characteristics of simple process steps, safety, easy control, easily available raw materials, small environmental pollution, mild experimental conditions, short time consumption, low cost and the like. The prepared catalyst has a wide application prospect in an electrolytic water oxygen evolution reaction in an acid environment.

The invention is applicable to the technical field of electrocatalytic material synthesis, and provides a preparation method and application of polyol-mediated tantalum-doped ruthenium dioxide, and the method comprises the following steps: firstly, adopting an isopropanol-glycerol polyol mixed solvent system, and realizing uniform mixing of a metal precursor through dual effects of molecular-level dispersion and controllable reduction; then, PVP is introduced in the hydrothermal process to serve as a difunctional regulating agent, the morphology guiding and steric hindrance effects are exerted synchronously, and grain agglomeration is inhibited. Medium and low temperature heat treatment at 300 DEG C is subsequently adopted, and the crystallinity of the material is improved while the integrity of the nanostructure is kept. The method innovatively solves the problems of phase splitting, contradictory relationship between crystallinity and specific surface area and the like caused by non-uniform doping in the traditional method through the synergistic effect of solvent system design, surfactant regulation and control and low-temperature heat treatment process, and has the advantages of simple process, controllable product structure and the like; and a new thought is provided for preparation of tantalum-doped ruthenium dioxide.

A method for denitrifying ammonia nitrogen wastewater containing chlorine-oxygen free radicals is disclosed. The method uses ruthenium dioxide / titanium dioxide (RuO2 / Ti) as the anode and mesoporous carbon-modified carbon paper (CMK-3 / CP) as the cathode. Sodium sulfate, sodium chloride, and iron-modified graphene oxide as the particle electrode are added to the container containing ammonia nitrogen wastewater, forming a dual-electrode and particle-electrode electrochemical ammonia nitrogen denitrification system. Oxygen is then introduced into the cathode region, and the electrolysis current density is controlled to achieve denitrification of the ammonia nitrogen wastewater. This invention utilizes RuO2 / Ti to oxidize chloride ions to active chlorine (ClO2). ‑ Simultaneously, oxygen is reduced to hydrogen peroxide through mesoporous carbon-modified carbon paper, and the generated active chlorine and hydrogen peroxide are enriched in iron-modified graphene oxide particles. The hydrogen peroxide is further absorbed by the Fe atoms in the iron-modified graphene oxide particles. 2+ / Fe 3+ The cyclic catalytic process generates HO•, which can react with active chlorine to generate ClO•. ClO• can selectively oxidize ammonia nitrogen to nitrogen gas, generating high steady-state concentrations of chloroxygen free radicals, thus achieving efficient denitrification treatment of ammonia nitrogen wastewater.

The utility model discloses a vibration durability high-energy hybrid tantalum capacitor, which comprises a shell, a seat support, a tantalum core, an insulation structure and a cover plate, the seat support, the tantalum core, the insulation structure and the cover plate are sequentially arranged in the shell from bottom to top, the tantalum core is arranged in the seat support, a lead is arranged on the tantalum core, and the cover plate is respectively connected with the shell and the insulation structure. The lead is provided with a pipe sleeve and sequentially penetrates through the insulation structure and the cover plate to extend out of the shell. The first cathode piece is physically isolated from the bottom of the tantalum shell through the seat support, the cathode ruthenium dioxide plating layer is prevented from being damaged in the vibration process, meanwhile, due to the fact that the seat support is designed to be closed, the tantalum core is fixed, and meanwhile insulation between the tantalum core and the tantalum shell is achieved. The fluororubber insulation ring is adopted to replace a traditional insulation upper gasket and a PTFE insulation ring, the number of internal parts is reduced, the stress area of the insulation ring is increased, 70% compression amount is adopted for fluororubber materials, and the buffer space of longitudinal fixed stress is increased.

The invention belongs to the field of nano materials, and discloses a dislocation type ruthenium dioxide catalyst as well as a synthesis method and application thereof. The synthesis method of the dislocation type ruthenium dioxide catalyst comprises the following steps: S1, dissolving 4, 4 '-dipyridyl and 2, 5-thiophenedicarboxylic acid in an alkaline solution with the pH value of 10-13, and adding a surfactant to obtain a double-ligand solution; under a stirring condition, adding a CoCl2 solution into the double-ligand solution for reaction, and then washing and drying to obtain a Co-MOF precursor; s2, dissolving a ruthenium source and the Co-MOF precursor in deionized water, carrying out ion exchange, washing, and drying to obtain a Ru-MOF precursor of cross-linked double ligands; and then the Ru-MOF precursor of the cross-linked double ligands is placed in the air atmosphere to be annealed, and the dislocation type ruthenium dioxide nano-particles are obtained. The method disclosed by the invention is mild and simple in reaction condition, the anion exchange reaction is carried out at room temperature, the annealing condition is mild, and the prepared RuO2 has excellent acidic electrolyzed water oxygen evolution catalytic performance.

The invention discloses a method for oxidizing primary alcohol into carboxylic acid. The invention relates to a method for producing carboxylic acids by oxidizing primary alcohols in the liquid phase in the presence of ruthenium dioxide as catalyst. The method using ruthenium dioxide as a liquid phase catalyst according to the present invention allows the desired carboxylic acid to be obtained with high selectivity, high weight hourly space velocity and thereby good space-time yield, and exhibits high robustness even after a prolonged reaction time.

The invention belongs to the technical field of electrochemical materials and application. The invention provides a multi-metal laminated titanium anode material which is mainly applied to the processes of water electrolysis hydrogen production, wastewater treatment, electrochemical energy storage and the like, and belongs to the directions of new energy and environmental governance. The multi-metal laminated titanium anode material sequentially comprises a titanium substrate, a bonding layer, a catalyst layer and a protective layer from bottom to top, the catalyst layer is made of a compound of ruthenium dioxide and iridium dioxide, the molar ratio of ruthenium dioxide to iridium dioxide is 1: (2-3), and the thickness of the catalyst layer is 3-4 microns. The prepared multi-metal laminated titanium anode material shows high stability and high efficiency in the fields of water electrolysis hydrogen production, wastewater treatment, electrochemical energy storage and the like, the service life can be prolonged, the energy utilization rate can be increased, and the multi-metal laminated titanium anode material meets the requirements of energy conservation and emission reduction, greenness and low carbon, resource recycling and strategic emerging industry development; and the method has remarkable economic benefits and social values.

The invention belongs to the technical field of catalyst preparation, and particularly relates to a C3N5 confined ruthenium dioxide nano-catalyst as well as a preparation method and application thereof. The nano-catalyst comprises a C3N5 carrier and RuO2 nano-particles, wherein the surface layer of the C3N5 carrier is coated with the RuO2 nano-particles; wherein the loading capacity of the noble metal Ru in the nano-catalyst is 3-5wt%. RuO2atC3N5 with a layered stacked rod-like structure is prepared by adopting C3N5 to limit ruthenium dioxide, nanoparticles are arranged on the surface layer of the catalyst, and ruthenium dioxide nanoparticles are coated on the surface layer of a carrier. The catalyst is simple in preparation method, low in cost and suitable for large-scale synthesis, has high potential industrial application value in the field of energy catalysis, and can be used for electrocatalytic water decomposition reaction, oxygen reduction reaction (ORR), carbon dioxide reduction reaction (CO2RR) and various organic catalytic reactions.

The present application belongs to the field of catalysis technology, and relates to a short-branched carbon nanotube / alloy / carbon fiber self-supporting catalytic electrode material and a preparation method and application thereof. A cloth-like carbon fiber is used as a three-dimensional skeleton, short-branched carbon nanotubes are connected to the surface of the three-dimensional skeleton through covalent bonds, and double-metal alloy nanoparticles are embedded on the tube body of the short-branched carbon nanotubes, the length of the short-branched carbon nanotubes is 0.1-2.5 microns, and the double-metal alloy nanoparticles are Co3Fe7 nanoparticles, Fe 0.64 Ni 0.36 nanoparticles or CoNi nanoparticles. The catalytic electrode material provided by the present application can work efficiently and stably under strong alkaline conditions, and simultaneously has dual-function activity of ORR and OER. Experiments show that when the catalytic electrode material is used as an anion exchange membrane water electrolysis anode catalyst, it can be stably operated for a long time; when used as a flexible zinc-air battery cathode catalyst, its cycle life is better than that of a commercial platinum-carbon and ruthenium dioxide catalyst.

The invention relates to a doped ruthenium dioxide catalyst as well as a preparation method and application thereof, and the preparation method comprises the following steps: dropwise adding a solution containing glucose, a dopant and a ruthenium source onto high-temperature hard template nanoparticles, and drying to obtain a precursor; calcining and roasting the precursor to obtain a doped ruthenium dioxide catalyst; wherein a doping element in the doping agent is selected from at least one of manganese, iron, cobalt, nickel, selenium, molybdenum or tungsten. The obtained doped ruthenium dioxide catalyst is used as an OER catalyst for acidic electrolyzed water. Compared with the prior art, the transition metal or nonmetal doped ruthenium dioxide catalyst prepared by the method has excellent oxygen evolution activity and stability in an acidic electrolyte, and has a wide application prospect in the field of water electrolysis.

The invention relates to a ruthenium dioxide and cobaltosic oxide mutual-doped composite nanomaterial for oxygen evolution reaction and a preparation method and application thereof.The composite nanomaterial comprises ruthenium-doped cobaltosic oxide and cobalt-doped ruthenium dioxide, and the ruthenium-doped cobaltosic oxide and the cobalt-doped ruthenium dioxide form a heterojunction structure; the ruthenium is doped in crystal lattices of the cobaltosic oxide, the cobalt is doped in crystal lattices of the ruthenium dioxide, and in the composite nano material, the atomic ratio of the ruthenium to the cobalt is (0.2-5): 1. The preparation method comprises the following steps: uniformly mixing a carbon precursor, a cobalt salt precursor and a ruthenium salt precursor, and then sequentially carrying out first-stage calcination in a specific atmosphere and second-stage calcination in an oxygen-containing atmosphere to obtain the mutually doped ruthenium dioxide and cobaltosic oxide composite nano material. Compared with the prior art, the oxygen evolution reaction catalytic activity can be effectively improved by forming a novel structure mutually doped with ruthenium dioxide and cobaltosic oxide.

The invention discloses a composite ruthenium plating solution which comprises the following components in parts by weight: 1 part of a ruthenium-containing compound precursor, 8-15 parts of an organic solvent, 0.05-0.5 part of a nano conductive enhancer, 0.01-0.06 part of a binder and 0.01-0.06 part of a flatting agent, the ruthenium-containing compound precursor is any one of ruthenium trichloride hydrate, anhydrous ruthenium trichloride or ruthenium nitrate, the organic solvent is at least one of absolute ethyl alcohol, isopropanol, n-butyl alcohol and terpilenol, and the nano conductive enhancer is at least one of graphene, carbon nanotubes and acetylene black; the binder is at least one of PVDF (Polyvinylidene Fluoride), polyvinylpyrrolidone and ethyl cellulose; the flatting agent is polyether modified polysiloxane and modified acrylate. The composite ruthenium plating solution can effectively improve the conductivity and adhesive force of a plating layer and enhance the uniformity and wear resistance of the plating layer. And a ruthenium-plated product with large capacitance, low equivalent resistance and strong binding force between a plating layer and a tantalum substrate is obtained by acting on the tantalum substrate.

The application relates to a ruthenium dioxide catalyst and a preparation method and application thereof, relates to the technical field of water electrolysis catalysts, and solves the problems of complicated preparation and poor stability of existing ruthenium-based oxygen evolution catalysts in the prior art. In the application, gelatin and a carbonate are dissolved in water, water bath stirring is carried out, and mixed solution A is obtained; a ruthenium salt is dissolved in water, ultrasonic treatment is carried out, and mixed solution B is obtained; mixed solution B is poured into mixed solution A, and after stirring and mixing, a gel is formed, which is a catalyst precursor; after calcination treatment, the ruthenium dioxide catalyst is obtained. The application has the advantages of low cost and good catalytic stability, and has a wide application prospect as a proton exchange membrane water electrolysis anode catalyst.

The invention provides a RuO2.xH2O / GP-based composite material as well as a preparation method and application of the RuO2.xH2O / GP-based composite material. The composite material comprises the following raw material components: ruthenium dioxide hydrate, graphite powder and epoxy resin glue, wherein the mass ratio of the ruthenium dioxide hydrate to the graphite powder is (2-3.5): 1; based on the mass of the graphite powder, the dosage of the epoxy resin glue is 1-3ml / g. The novel metal oxide composite type pH sensitive electrode has remarkable advantages, and the excellent machinability enables the novel metal oxide composite type pH sensitive electrode to be adaptive to various sensor frameworks; good shape plasticity allows the composite material to be prepared into various physical shapes; meanwhile, the method has the advantages of convenience in operation and cost effectiveness, and an ideal sensitive material selection is provided for pH sensing application.

The invention relates to the field of advanced non-ferrous metal material high-heat-insulation coating protection, in particular to a composite oxide ceramic coating preparation method based on an electrophoretic deposition technology. Firstly, the heat-resistant steel surface is pretreated, and surface oil stains and oxidation impurities are removed; then a nickel-based electroplating solution containing rhenium chloride and ruthenium chloride is prepared, the pretreated heat-resistant steel part is placed in the nickel-based electroplating solution to be subjected to electro-deposition, and a nickel-rhenium-ruthenium composite metal bonding layer is formed on the surface of the nickel-based electroplating solution; then preparing a composite ceramic suspension, taking acetonitrile as a solvent, taking 3, 3-dimethoxypropionic acid as an additive, containing YSZ powder and nano ruthenium dioxide-rhenium oxide mixed powder, and putting the part with the metal bonding layer into the suspension for electrophoretic deposition to form a composite oxide ceramic coating precursor; and then the ceramic coating is placed in a high-temperature furnace protected by inert gas to be sintered, interface fusion of the bonding layer and the ceramic coating and densification of the ceramic coating are achieved, and the ceramic coating has excellent heat insulation performance and strong interface bonding force.

The invention discloses a small-size ruthenium dioxide nano material and a preparation method and application thereof, and particularly relates to the technical field of electro-catalytic materials.The preparation method comprises the following steps that a titanium sheet is placed in an oxalic acid solution to be etched, cleaned and dried to serve as a substrate; the preparation method comprises the following steps: adding sodium bromide as a size regulating agent into a ruthenium dioxide precursor solution, and mixing, drying and calcining to obtain the ruthenium dioxide nanocrystal of which the particle size is obviously reduced. The preparation process of the material is simple, the used sodium bromide is low in price, and the method does not need complex equipment or post-treatment steps; the prepared catalyst has a higher specific surface area and more active sites, shows excellent catalytic activity and stability in an acidic electro-catalytic oxygen evolution reaction, and has a great application prospect.

The application discloses nano-ruthenium dioxide and a preparation method thereof, and belongs to the technical field of materials. The preparation method is a homogeneous hydrothermal method for preparing the product. By setting parameters of a reaction system, the nano-ruthenium dioxide product with high yield, high purity, high specific surface area and high crystallinity can be prepared in a short time.

The invention discloses a nanorod-shaped nitrogen-doped ruthenium dioxide chlorine evolution catalyst and a preparation method thereof. The nitrogen-doped ruthenium dioxide catalyst is obtained by mixing ruthenium trichloride and a nitrogen-containing precursor according to a certain proportion, dissolving the mixture in absolute ethyl alcohol, drying and calcining at a certain temperature. The microstructure of the nitrogen-doped ruthenium dioxide catalyst is in a nanorod shape, the nitrogen element is uniformly distributed in the nanorod, and the catalyst contains unsaturated coordinated Ru < 3 + >. A titanium sheet is coated with the prepared nitrogen-doped ruthenium dioxide catalyst by a spin-coating method for electrochemical testing and chlorine evolution activity testing. Compared with undoped ruthenium dioxide, the nitrogen-doped ruthenium dioxide has the advantages that the chlorine evolution potential is reduced, the electrochemical active area is increased, the electron transfer capability is improved, and the chlorine evolution activity is obviously improved. The nitrogen-doped ruthenium dioxide catalyst disclosed by the invention has the advantages of high chlorine evolution activity, simple preparation process and easiness in large-scale production.

The invention relates to a ruthenium dioxide coated electrostatic spinning precursor, a preparation method and a positive electrode material. The preparation method comprises the following steps: preparing a nickel-cobalt-manganese precursor fiber through electrostatic spinning; and dipping the nickel-cobalt-manganese precursor fiber in ruthenium precursor sol, pulling to form a film, drying and calcining to obtain the ruthenium dioxide coated electrostatic spinning precursor. The nickel-cobalt-manganese precursor fiber prepared by electrostatic spinning has a high specific surface area and a uniform structure, and is beneficial to electron ion transmission; a nano-scale uniform coating layer is formed by high-conductivity ruthenium dioxide through a sol-gel method, so that an electronic high-speed channel can be constructed to reduce impedance so as to relieve polarization and improve the rate capability and the capacity retention ratio, the electrolyte is physically isolated to inhibit side reaction, and the CEI layer thickening is reduced so as to improve the cycling stability; the combination of the two avoids the problem of non-uniform traditional coating, and the electrochemical performance is improved.

The application discloses application of a heteroatom-doped ruthenium dioxide catalyst in a hydrogen evolution reaction, wherein the heteroatom is one of transition metals or rare earth metals, and the transition metals or rare earth metals are doped into a ruthenium dioxide crystal lattice. The catalyst is used in an alkaline water electrolysis hydrogen evolution reaction, and excellent hydrogen evolution performance is exhibited.

The application discloses a preparation method of micro-nano hierarchical structure ruthenium dioxide self-assembled hollow spheres, which comprises the following steps: dissolving a soluble ruthenium salt in water, adding the soluble ruthenium salt into a water solution in which a sulfonic acid type surfactant is dissolved, stirring uniformly, carrying out a hydrothermal reaction, centrifuging, drying and calcining at a certain temperature, and obtaining rutile RuO2 self-assembled hollow sphere structures with uniform size and controllable morphology. The application has the advantages that raw materials are easy to obtain, the synthesis process is environment-friendly (water is used as a solvent), the process is simple, the product morphology is controllable, the hollow sphere structure has an electrolyte accessible inner and outer surface, and the stability of the micro-nano three-dimensional building structure, and can be used in the fields of catalysis, electrochemical energy storage, sensing and the like.

The application relates to the field of electrochemical energy storage, in particular to a ruthenium dioxide-cellulose nanofiber composite self-supporting electrode material and a preparation method thereof, and a pseudo-capacitive capacitor. The ruthenium dioxide-cellulose nanofiber composite self-supporting electrode material is prepared through a series of steps of in-situ growth of uniformly distributed ruthenium nanoparticles with a particle size of 1-3 nm on surface-modified cellulose nanofibers, vacuum filtration and drying to form a self-supporting three-dimensional network structure, and low-temperature annealing to oxidize the ruthenium nanoparticles. The preparation method can overcome the problems of easy agglomeration and easy falling-off of ruthenium dioxide particles in current industrial preparation, and the prepared electrode material has good flexibility and extremely low self-weight, and can guarantee excellent specific capacitance.

The invention discloses a resistance paste suitable for a flexible printing electronic technology and a preparation method thereof, the paste is composed of the following components: 20%-50% of a functional conductive phase which is a compound mixture of conductive carbon black, graphene nanosheets and ruthenium dioxide nanoparticles; 15%-33% of a modified resin binding phase; 25%-45% of a reactive diluent and a solvent; and 2%-5% of an auxiliary agent. The preparation method comprises the following steps: pre-dispersing, grinding, mixing, defoaming, filtering and the like. Through the ternary compound conductive phase and the UV curing system, the resistance paste with wide sheet resistance range, excellent environmental durability and good flexographic printing adaptability is successfully obtained. The paste can be directly printed on a flexible base material to form a high-performance resistor body, can replace a traditional chip resistor, is particularly suitable for large-scale manufacturing of printed circuits, and can remarkably save labor and material cost and improve production efficiency and circuit reliability.

The present application relates to the technical field of hydrogen production material by electrolysis of water, in particular to a kind of double electrode material for hydrogen production by electrolysis of water in acidic environment and preparation method thereof;Using hydrothermal method and annealing method in combination to prepare ruthenium dioxide loaded on carbon sphere, or cerium dioxide loaded on carbon sphere, or ruthenium dioxide / cerium dioxide heterojunction loaded on carbon sphere to obtain bifunctional electrocatalyst for anode oxygen evolution and cathode hydrogen evolution, double electrode material is obtained by dropping coating bifunctional electrocatalyst on carbon paper;The electrode prepared in the application has lower oxygen evolution and hydrogen evolution overpotential in acidic environment, and shows good structural stability and better overall water electrolysis catalytic activity under long-term acidic electrolysis conditions.The preparation process is simple, the content of noble metal is low, the electrode components and types are adjustable, and has wide application prospect.